TrueTransparency is a freeware that changes the windows border adding png support and so true transparency. The new version brings Aero Snap and Aero Shake effects.

This is a relatively new application that allows you to modify windows in ways that .msstyle files can't. MsStyles do not allow you to have transparent/translucent window borders. Also .msstyle files were not designed to have wide, irregular window borders.